[ISSUE #23]add unit test to increase codeCov

[tianliuliu]

fix #23 mqtt-ds/src/test/java/org/apache/rocketmq/mqtt/ds/test/LmqOffsetStoreManagerTest.java
add unit test for LmqOffsetStoreManagerTest.java to increase the codeCov

[ShannonDing]

try run “mvn -B clean apache-rat:check” local.

[codecov-commenter]

Codecov Report

Merging #28 (00a430e) into main (0f2a830) will increase coverage by 1.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   19.84%   21.09%   +1.24%     
==========================================
  Files          87       87              
  Lines        3723     3721       -2     
  Branches      610      610              
==========================================
+ Hits          739      785      +46     
+ Misses       2776     2722      -54     
- Partials      208      214       +6     

Impacted Files	Coverage Δ
...t/cs/protocol/mqtt/handler/MqttConnectHandler.java	0.00% <0.00%> (ø)
...t/cs/protocol/mqtt/handler/MqttPublishHandler.java	0.00% <0.00%> (ø)
...cs/protocol/mqtt/handler/MqttSubscribeHandler.java	0.00% <0.00%> (ø)
.../rocketmq/mqtt/ds/store/LmqOffsetStoreManager.java	63.01% <0.00%> (+63.01%)	⬆️

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[ShannonDing]

LGTM